Interface 
Isolated Interface 
Digital Isolation 
Isolated Sensing 
Signal Chain 
Sensor 
Isolated Driver 
Power Management 
Driver & Switch 
CA-IS3721LS
CA-IS3721LS
Active
Dual Channel Standard Digital Isolators
The CA‐IS372x devices are high‐performance dual ‐ channel digital isolators with up to 3.75kVRMS (narrow‐ body package) and 5kVRMS (wide‐body package) isolation rating and ultra‐fast data rate. The CA‐IS372x devices provide high electromagnetic immunity and low emissions at low power consumption, while isolating CMOS digital I/O. Each isolation channel has a logic input and output buffer separated by capacitive silicon dioxide (SiO2) insulation barrier, and each channel input integrated Schmitt trigger to provide excellent noise immunity.
The CA‐IS3720 features two channels transferring digital signals in one direction for applications such as isolated digital I/O. The CA‐IS3721/CA‐IS3722 devices have 2 channels with 1 channel in each direction, making them ideal for isolating the Tx and Rx lines of a transceiver, such as RS485, CAN etc. communication. When the input is either not powered or is open‐circuit, the default output is low for devices with suffix L and high for devices with suffix H.
The CA‐IS372x family are specified over the ‐40°C to +125°C operating temperature range and are available in 8‐pin SOIC narrow body package, 8‐pin SOIC wide body package and 16‐pin SOIC wide body package.
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Features
Data rate
DC to 150Mbps
Robust isolation barrier
High lifetime: >40 years
Up to 5000 VRMS isolation rating (Wide body packages)
±150 kV/μs typical CMTIWide supply range
2.5V to 5.5V
Wide operating temperature range
-40°C to 125°C
No start-up initialization required
Default output High (CA-IS372xH) and Low (CA-IS372xL) Options
High electromagnetic immunity
Low power consumption
1.5mA per channel at 1Mbps with VDD = 5.0V
6.6mA per channel at 100Mbps with VDD = 5.0VBest in class propagation delay and skew
12ns typical propagation delay
2ns propagation delay skew (chip -to-chip)
1ns pulse width distortion
5ns minimum pulse widthSchmitt trigger inputs
Package options
Narrow-body SOIC8(S) package
Wide-body SOIC8(G) package
Wide-body SOIC16(W) packageSafety regulatory approvals
VDE 0884-11 isolation certification
UL according to UL1577
IEC 62368-1, IEC 61010-1, GB 4943.1-2011 and GB 8898-2011 certifications -
Applications
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Industrial Automation
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Motor Control
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Medical Systems
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Isolated Power Supplies
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Solar Inverters
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Isolated RS485, CAN, RS232 etc.
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Device Information
Part number Package Package size (NOM) CA-IS3720
CA-IS3721
CA-IS3722SOIC8(S) 4.90mm×3.90mm SOIC8-WB(G) 5.85mm×7.50mm SOIC16-WB(W) 10.30mm×7.50mm -
Simplified Functional Diagram
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Technical Documentation
Category
Title
Last Updated
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Title: APPNOTE
Last Updated: Feb 21,2023
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Title: Datasheet
Last Updated: Dec 15,2022
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Certification Standards
Category
Title
Certification Number
Date
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Title: CQC
Certification Number: CQC24001452685
Date: Dec 26,2024
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Title: Reliability Test
Certification Number: CA-IS37XX
Date: Feb 19,2022
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Title: VDE
Certification Number: 40052786
Date: Aug 18,2023
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Title: UL
Certification Number: UL-US-L511334-11-71100202-9
Date: Sep 06,2023
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